Can dreams be enough to keep someone alive?

I was talking to another Fluther user and thought about something. I have been depressed for a while, but since my friend died I have just been a suicidal train wreck. Anyway, in my dreams I have my perfect life and everything is just the way I wanted it. I’m married to my friend who passed away, we have our kids, and like I said… everything is perfect. I was wondering if I find nothing great to live for in reality, can dreams be worth it? I mean in our dreams everything is how we want it. I know that they are just dreams, but at least I can have my “wanted” life there for a little while. I feel like I’m not making sense..